I think nor-nicotine is the alkaloid that converts to Tobacco Specific Nitrosamines (TSNA) enzymatically during curing. This is the reason what LC (low converter) strains of tabacum are, they dont convert much nicotine to nornicotine in an attempt to lower TSNAs in the resulting tobacco

I get this quite often, especially when I have to take opioid painkillers, so its not a surprise that kratom may cause it too. I usually wake up, cant move and then there is someone in the room with me walking towards me very ominously like they are going to cause me harm. And then I wake up drenched in sweat heart pounding. This will repeat many times in a night until I eventually stop trying to sleep.
I found the best way to get through it is to put a movie on my phone and put in ear plugs. I usually watch a narnia film because its on youtube and is a very calm movie.
Do you also sleep walk? I do this quite often too. People have seen me open the back door and go for walks at night, its so weird. The worst thing I do is piss on things. Ill wake up and go piss on a tv or something, so embarrassing. One time I was at a party and fell asleep, i woke up to this guy yelling at me. I'd walked into his room and started pissing on his bed/him.

Taking the top of a keg out is actually pretty easy. Just google the type of keg and you'll be able to find a video describing how to do it. Home distillers use them for boilers all the time so theres lots of info out there. To find out what type it is just look at the top and compare it against photos online.
The good thing about using a keg is that the hole connects directly to a 2 inch triclamp fitting which makes everything very easy.
If you arent going to be consuming your oils you can get away with using much shitter materials. Those cheap steel 44 gallon drums work fine

Making essential oils is really easy and doesnt really require much in the way of equipment. If you can source a big bucket, a 44 gallon drum and some copper pipe you can make an essential oil still.
Use flour paste to seal everything on your hot side. As steam hit it is cooks it into a bread and seals the join. On the lid of your 44 gallon drum just put a snake of flour paste around it, will seal up well.
Make sure to keep a record of how much water you put in and how mucch you take out, you dont want to be letting it boil dry. Collect all your distillate and put it in a big bucket and let it sit for a few days. Oil will continue to crash out for a few days.
I drew a quick picture for you. A few things to make it better is to have a another 44 gallon drum next to it that you heat water with to refill the herb boiler. And insulation for the main boiler will speed things up immensely. Insulation bats work and are usually flame retardant (and you can get them at the dump). The water in the condenser barrel will get hot eventually but quicker than you think. Have a way to drain water and top it up.
Heat the drum using gas (youll need insultation for sure) or using wood. Just hoist the boiler up on some bricks.